4x6 to 6.5" speaker adapter for e21 bmw 320i

thingiverse

I was trying to find a way to get a little more sound out of the stereo in my classic 1981 bmw 320i, and so decided to see what it would take to get 6.5" speakers to fit in the factory 4x6 location without cutting any holes. I made these speaker pods as a result, they are countered to avoid the lip on the rear parcel shelf, and will fit most 6.5" speakers. Speakers with larger magnets may need more clearance. Printed with 70% infill so they'd have some heft. So far they fit and sound great, I'm experimenting with different mounting options, the holes are meant for the factory mounting points, if you have better ideas feel free to leave in the comments.